时态

	一般时	进行时	完成时	完成进行时
现在	do	doing	has/have done	has/have been doing
过去	did	was/were doing	had done	had been doing
将来	will do / be going to do	will be doing	will have done	will have been doing
过去将来	should/would do	should/would be doing	should/would have done	should/would have been doing

一般将来时

be about + 不定式

可表将来，但不可与表将来的时间状语连用

Eg:

1. The team is about to play an important match.
2. We are about to leave,so there is no time to drop in on her now.

be + doing(仅位移动词)

同样可表将来，这类词有go,come,leave,start,begin,arrive,run,stay,take……

Eg:

1. I'm going to John's house next Sunday.
2. He is leaving school in three months.